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54 = a x 12/2
54 = a x 6
a = 54/6
= 9
Sisi miring = √12²+9²
= √144+81
= √225
= 15 cm
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1/2 . a . t = 54
1/2 . a . 12 = 54
a . 6 = 54
a = 9 cm
sisi miring² = 12² + 9²
= 144 + 81
= 225
sisi miring = 15 cm